Police in the Spanish city of San Sebastián de la Gomera have cordoned off an abandoned house after finding a 22-foot-long wasp nest.

As ThinkSpainreports, officers were called to the scene by concerned neighbours. The massive nest is located in a hallway and may contain millions of wasps. Experts say that the common wasp found in Spain could never build a nest of this size, leading them to think that it's an invasive species from Africa.